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Finance Receivables, Net - Summary of Impaired Loans by Class of Finance Receivable (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Mar. 31, 2018
Impaired Finance Receivables    
Impaired Finance Receivables Individually Evaluated with Related Allowance $ 321 $ 248
Impaired Finance Receivables Individually Evaluated with No Related Allowance 302 247
Impaired Finance Receivables 854 717
Individually Evaluated Allowance 99 70
Wholesale [Member]    
Impaired Finance Receivables    
Impaired Finance Receivables Individually Evaluated with Related Allowance 161 107
Impaired Finance Receivables Individually Evaluated with No Related Allowance 130 83
Impaired Finance Receivables 291 190
Individually Evaluated Allowance 28 14
Real estate [Member]    
Impaired Finance Receivables    
Impaired Finance Receivables Individually Evaluated with Related Allowance 93 86
Impaired Finance Receivables Individually Evaluated with No Related Allowance 152 142
Impaired Finance Receivables 245 228
Individually Evaluated Allowance 11 5
Working capital [Member]    
Impaired Finance Receivables    
Impaired Finance Receivables Individually Evaluated with Related Allowance 67 55
Impaired Finance Receivables Individually Evaluated with No Related Allowance 20 22
Impaired Finance Receivables 87 77
Individually Evaluated Allowance 60 51
Retail Loan [Member]    
Impaired Finance Receivables    
Impaired Finance Receivables Aggregated And Evaluated For Impairment 231 222
Impaired Finance Receivables $ 231 $ 222